is there any simple code for this to solve larger matrices?

function b =check(Q)
Qmd2(1,1)=Q(1);
Qmd2(2,1)=Q(2);
Qmd2(3,1)=Q(3);
Qmd2(1,2)=Q(4);
Qmd2(2,2)=Q(5);
Qmd2(3,2)=Q(6);
disp(Qmd2);
c=[1 2;1 3;1 4];
b=c.*Qmd2;
disp(b);

[Stephen23]

 doc reshape

[Jan]

@Aimen: Please explain what you want to achieve. How will c look like if the input has 8 elements?

Answer 1

[Jan]

A bold guess - I'm not sure what you exactly want:

    function b = check(Q)
    Q = Q(:);
    n = numel(Q);
    b = [Q(1:n / 2), Q(1+n/2:n) .* (2:1+n/2).'];

This works for inputs with an even size of elements only.